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    18 Famous Songs You Didn’t Know Were Written By Other Famous People

    Harry Styles writing for Ariana Grande? Incredible.

    We all know that not every singer out there writes their own songs. (And we also all know that that Ed Sheeran and Sia are behind like half the biggest hits in pop music.)

    But it's always jarring when you hear that a song you've been singing along to for a decade is actually written by someone completely different. So without further ado, here are the songwriters behind some massive songs that kind of break our brains when we think too hard about it.

    1. "Breakaway" by Kelly Clarkson

    Kelly Clarkson sings into the microphone while looking at the camera

    2. "This Is What You Came For" by Calvin Harris and Rihanna

    Rihanna stands in front of a lit-up wall, with club lasers, and is singing to the camera with her hands outstreched

    3. “Pretty Hurts” by Beyoncé

    Beyonce stands on a stage in front of a row of other women, she's wearing a ballgown and a sash that reads 'Miss 3rd Ward', and is holding hands with a man in a hux

    4. Till the World Ends” by Britney Spears

    Britney Spears wears a black leather studded jacket on the set of a music video, looking at the camera

    5. Whataya Want from Me” by Adam Lambert

    Adam Lambert, dressed in all black, walks through what looks like an art gallery

    6. Little Things” by One Direction

    Zayn and Harry from One Direction sit in a recording studio in a black and white screenshot

    7. Party in the U.S.A.” by Miley Cyrus

    Miley Cyrus stands on stage singing into a microphone as the American flag waves behind her

    8. "Fuck You" aka "Forget You" by CeeLo Green

    A woman sits in a diner looking off camera, away from the person across from her, in a still from a music video

    9. "Baby" by Justin Bieber

    A young Justin Bieber sings while looking at the camera, a blurry night time street is behind him

    10. "Hollaback Girl" by Gwen Stefani

    Gwen Stefani wers a black beanie and holds her finger to her lips in a 'shh' gesture

    11. "American Boy" by Estelle and Kanye West

    A black-and-white still of Estelle looking at the camera, Kanye West speaking into her ear

    12. "Unthinkable" by Alicia Keys

    Alicia Keys reaches out to the camera, the other hand on her chest, as she stands in front of a tree

    13. "Islands in the Stream" by Kenny Rogers and Dolly Parton

    Kenny Chesney, in a white suit, and Dolly Parton, in a glittery red dress, sing together on stage

    14. "Red Red Wine" by UB40

    A close up of a man, in a black-and-white video clip

    15. "The Monster" by Rihanna and Eminem

    Rihanna sits in a chair, playing a therapist, while Eminem (out of focus) reclines on a chair in the foreground

    16. "Irreplaceable" by Beyoncé

    Beyonce stands holding a nail file, looking off-screen, in a house

    17. "Just a Little Bit of Your Heart" by Ariana Grande

    Ariana Grande on stage, with a microphone in front of her, covering her face with her eyes shut

    18. "Miss Independent" by Kelly Clarkson

    Kelly Clarkson looks into the camera and sings into a microphone